Block mold



July 5, 11949. A. M. RASMUSSEN BLOCK MOLD Filed June 2, 1945 845M555 BYATTO IyEY Patented July 5, 1949 UN! TED STATES NT OF Fl CE.

Calif.

Application June 2; 1945; Serial No. 597,246

1- Claims (01. as -r211);

This inventionrelates generally to plastic blmk and earthenware"apparatus, and more particul'arlyto molds for receiving a cementitiousor plastic material having sufiicient cohesion to retain the shape givenit by the mold upon removal of thelatter from the material.

It is an object of this invention to provide a mold particularlyadapted, although not necessarily, for molding blocks from cementitiousmaterial for building walls, retaining walls and similar structures,which mold is structurally characterized in a simple manner enablingundercut locking grooves to be molded in the side faces of the blocksfor the locking of coats of plaster, cement stucco, or other surfacefinishing mate-- rial to the blocks when assembled into a wall, to theend of enabling such outside and inside surface coatings to be directlyapplied to the wall without the use of separate metal lath, paperbackedlathing, or wood lath, thus producing a considerable saving in the costof a wall, as well as expediting the construction thereof.

It is another purpose of this invention: to provide a mold of the abovedescribed character whose sides and ends are relatively movable in amanner to permit the mold to be expanded or released from the moldedblock immediately after pouring, and whose elements for forming theaforesaid locking grooves are capable of being readily withdrawn clearof the molded grooves in the block faces, so as to leave the block freefor opening of the mold, with the locking grooves perfectly formed andintact.

It is a further purpose of this invention to provide a mold with whosesides and ends a removable core is adapted to be accurately positionedto form a hollow block with side and end walls of predeterminedthicknesses, and an opening through the block from top to bottom for-21:- tion with other identical blocks in producing dead .air spaces inthe wall to act as an insulating medium for same.

With these and other objects in view, the invention resides in thecombinations, arrangements and functional relationships of elements asset forth in the following specification and particularly pointed out inthe appended claim.

In the accompanying drawing,

Figure 1 is a plan view, partly in section, of one form of block moldembodying this invention;

Figure 2 is a vertical longitudinal sectional view taken on the line 2-2of Figure 1;

Figure 3 is a vertical transverse sectional view taken on the line 33 ofFigure 2; and

2'; Figure 4 is a perspective view of the product embodying thisinvention.

Referring specifically to the drawing, the invention in its illustratede'mbodiment comprises an open-topped bottomle'ss 'form- F which may beconstructed of weed or metal toprovide flat, rectangular side walls'l-lland H, and fiat, rectan'gular'e'nd walls 02 and [3, the side wallIt) being pivotauy connected at it's ends to the end walls 12 and I3 bysuitablehinges I 4 and t5, respectively; One end" of the side wall II ispivotally connected to'the endwall 13' by a suitable hinge F6 and isadapted to be latched at its other end by a pull type latch- I to theend wall F2, to releasably retain the form rigidly in itscl'os'edpositionas shown, wherein the right angularly disposed ends of the sidewalls I!) and Iltiightl'y abut the inside surfaces of the end walls [2and I3 to maintain the form in perfectly rectangular formation.

The form is adapted to rest upon a suitable flat pallet or baseand isadapted to freely receive a removable core 21 which latter will alsorest upon thepallet 2W. The-core may be'constl'ucted of Wood or metaland is of generally rectangular contour and of sufficient height toproject above the top surface of the form for convenient grasping of ahandle 22 to place and remove the core. Centering arms 23, 23 and 24, 24project from the Sides and ends, respectively, of the core, and areprovided with depending stops 25 and 26 respectively, which are adaptedto engage the side and end walls H], H, l2 and I3, to maintain the corein a predetermined spaced relation to such walls in order to mold theblock E (Figure 4) with side walls 21 and end walls 28 of predeterminedthicknesses, and with an opening 29 extending through the block from topto bottom.

The end walls I 2 and I 3 of the form F are provided on their innersides with projections 30 and 3|, respectively, extending from top tobottom of such walls and adapted to mold recesses 32 in the end walls 28of the block B for the reception of a cement key (not shown), or thepassage of a reinforcing rod during construction of a wall composed ofsuch blocks.

Co-acting with the sides and ends of the form F are two elements G ofidentical construction, for molding dovetailed or other undercut lockinggrooves 33 in the exterior surfaces of the side walls 21 of the block.Each of these elements G is composed of a plurality of molding bars 35having opposite edges beveled as shown at 36 in Figure 3, and providedwith guide ribs 31 coextensive in length therewith. These molding freeend portions of the bars finally seating in 1 pockets 44 and 45 in theend walls when the elements occupy the fully inserted position shown inFigures 1 and 2, all to the end of rigidly supporting the elements G inthe operation of the invention which is as follows:

With the parts of the form F in the assembled and closed position shownin the drawing, cement mortar or other plastic material to be used, ispoured into the form, tamped, and leveled ofi flush with the top surfaceof the side and end walls. The mixture used is intended to besufficiently stiff as to be non-slumping, thus permitting the core 2| tobe immediately removed and the elements G to be withdrawn, leaving thedovetailed grooves 33 accurately molded in the side faces of the blockB, following which the latch I1 is released and the form opened asindicated in broken lines in Figure 1, to leave the molded blocksupported by the pallet 20, upon removal of the form therefrom.

The form can now be reused for the molding of another block, byproviding another one of the pallets 20, which operation can be repeatedto mold as many blocks as desired. The completed block B with itscentral opening 29 forming an air space, its recesses 32 providing forcement plugs or keys between the blocks of each row when laid in mortarto form a wall as well as enabling reinforcing rods to pass betweenblocks, and its grooves 33 providing means to securely lock stucco orplaster coats to the wall without extraneous lathing or furring of anykind, greatly facilitates construction of an outside and inside finishedwall, and materially reduces the cost thereof.

I claim:

In a block mold, two side walls and two end walls adapted to define anopen-topped bottomless form of rectangular contour; means hingedlyconnecting said walls at three corners of the form, with the fourthcorner thereof left free; means for releasably connecting said walls atsaid fourth corner of the form to provide a rigid openable enclosureadapted to be placed on a pallet for the molding of a block in the form;a core placed in the form from the top thereof; centering armsprojecting from the core and having depending stops engaging the sideand end walls to maintain the core in a predetermined spaced relation tosaid walls; one of said side Walls having a plurality of parallel,longitudinally extending guide channels, and said end walls havingopenings and pockets, respectively, coacting with said channels; aplurality of molding bars having guide ribs; a handle to which one endof each of said bars is secured to connect the bars in parallelism forinsertion as a unit through said openings of the one end wall, with saidribs received in said channels and the free ends of said bars seating insaid pockets of the other end wall so as to rigidly support the moldingbars in the form for the molding of grooves in an exterior face of theblock. ARTHUR. M. RASMUSSEN.

REFERENCES CITED The following referenlces are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 341,161 Ormerod May 4, 1886674,035 Meeker May 14, 1901 1,437,503 Ellis Dec. 5, 1922 1,457,991 MooreJune 5, 1923 1,635,093 McPherson et a1. July 5, 1927 1,905,897 CahillApr. 25, 1933 2,198,688 Williamson Apr. 30, 1940 2,367,486 Denham Jan.16, 1945

